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United States Patent | 5,164,792 |
Matsui, deceased ,   et al. | November 17, 1992 |
A table carrier system of the present invention has a movable table for carrying an object. A displacement detecting system for detecting the displacement of the table by using an interference of light, and a table driving system positions the table according to the detected displacement. If a scaling amount is set in order to change a predetermined displacement range of the table, a reference value of wavelength set in the detecting system is changed in compliance with the scaling amount.
Inventors: | Matsui, deceased; Yuji (late of Tokyo, JP); Matsui, legal representative; by Michiko (Saitama, JP); Nonaka; Jun (Tokyo, JP) |
Assignee: | Asahi Kogaku Kogyo Kabushiki Kaisha (Tokyo, JP) |
Appl. No.: | 554850 |
Filed: | July 20, 1990 |
Jul 20, 1989[JP] | 1-185995 |
Current U.S. Class: | 356/500 |
Intern'l Class: | G01B 009/02 |
Field of Search: | 356/358,363 |
4643577 | Feb., 1987 | Roth et al. | 356/358. |
4814625 | Mar., 1989 | Yabu | 356/358. |